Fix scenario with importMap at root and imports in member (#1426)

Author: dsherret

runtime/fundamentals/workspaces.md

@@ -286,7 +286,7 @@ root and its members:
 | Option             | Workspace | Package | Notes                                                                                                                                                                                                                                                                                                  |
 | ------------------ | --------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | compilerOptions    | ✅        | ❌      | For now we only allow one set of compilerOptions per workspace. This is because multiple changes to both deno_graph and the TSC integration are required to allow more than one set. Also we’d have to determine what compilerOptions apply to remote dependencies. We can revisit this in the future. |
-| importMap          | ✅        | ❌      | Exclusive with imports and scopes per config file. It is allowed to have importMap in the workspace config, and imports in the package config.                                                                                                                                                         |
+| importMap          | ✅        | ❌      | Exclusive with imports and scopes per config file. Additionally, it is not supported to have importMap in the workspace config, and imports in the package config.                                                                                                                                     |
 | imports            | ✅        | ✅      | Exclusive with importMap per config file.                                                                                                                                                                                                                                                              |
 | scopes             | ✅        | ❌      | Exclusive with importMap per config file.                                                                                                                                                                                                                                                              |
 | exclude            | ✅        | ✅      |                                                                                                                                                                                                                                                                                                        |